نتایج جستجو برای: alkali catalyst

تعداد نتایج: 60055  

2008
Do Heui Kim Ja Hun Kwak János Szanyi Xianqin Wang Jonathan C. Hanson Charles H.F. Peden

Introduction Removal of harmful NOx emissions from lean burn and diesel engines in the presence of excess oxygen presents a great challenge. Lean-NOx traps (LNTs, aka NOx storage/reduction (NSR) catalysts or NOx adsorbers) are one of the promising technologies to remove NOx effectively. In the LNT technology, an active (alkali and/or alkaline earth) oxide material takes up NOx under lean engine...

Journal: :Catalysts 2021

Various compounds prepared using glycerol, diglycerol (DG), and triglycerol (TG) have been gaining increasing attention due to their wide range of applications. To increase the yield selectivity DG TG syntheses, previous studies investigated a variety catalysts with different basicity variable reaction temperatures. In this study, we introduced additives that act as inhibitors etherification fo...

Journal: :ChemSusChem 2013
Pierre Y Dapsens Cecilia Mondelli Javier Pérez-Ramírez

Desilication of commercial MFI-type (ZSM-5) zeolites in solutions of alkali metal hydroxides is demonstrated to generate highly selective heterogeneous catalysts for the aqueous-phase isomerization of biobased dihydroxyacetone (DHA) to lactic acid (LA). The best hierarchical ZSM-5 sample attains a LA selectivity exceeding 90 %, which is comparable to that of the state-of-the-art catalyst (i.e.,...

2009
Roopa H. Patil Praveen N. Naik Sharanappa T. Nandibewoor

The kinetics of Osmium(VIII) (Os(VIII)) catalysed oxidation of diclofenac sodium (DFS) by diperiodatoargentate(III) (DPA) in alkaline medium at a constant ionic strength of 0.60 mol dm -3 has been studied spectrophotometrically. The stoichiometry was found to be 1:1 i.e, one mole of DFS reacted with one mole of DPA. The reaction was first order with respect to [DPA] and [Os(VIII)], less than un...

2001
J C Slaa J G Van Ommen J R H Ross

This paper gives a review of research work in the synthesis of higher alcohols over catalysts based on Cu/ZnO/Al,O,, emphasizing three main topics: (i) the effect on selectivity of the addition of several compounds to this catalyst, (ii) the effect on selectivity of the reaction conditions used, and (iii) the reaction network leading to the different products found. Although the use of aLkali c...

Journal: :Physical chemistry chemical physics : PCCP 2013
Xiangqing Fang Qiang Wang Anmin Zheng Yueming Liu Longfei Lin Haihong Wu Feng Deng Mingyuan He Peng Wu

F-Ti-MWW was post-synthesized by implanting fluorine species into a Ti-MWW framework through an acid treatment process in the presence of ammonium fluoride. The effects of NH4F addition amount, acid treatment temperature and precursor Ti content were investigated on the incorporation of F species, the zeolite structure and the coordination sites of Ti. Fluorine-implanting improved the surface h...

2016
Jan KysElKa

Kyselka J., Thomes L., Remišová S., Dragoun M., Berčíková M., Filip V. (2016): Preparation of conjugated linoleic acid enriched derivatives by conventional and biphasic isomerisation. Czech J. Food Sci., 34: 511–521. The preparation of conjugated linoleic acid (CLA)-enriched free fatty acids by industrial processes compared with our biphasic isomerisation experiments in a special designed react...

2014
Hwei Voon Lee Joon Ching Juan Nurul Fitriyah Binti Abdullah Rabiah Nizah MF Yun Hin Taufiq-Yap

BACKGROUND Transesterification catalyzed by solid base catalyst is a brilliant technology for the noble process featuring the fast reaction under mild reacting condition in biodiesel production. Heterogeneous base catalysts are generally more reactive than solid acid catalysts which require extreme operating condition for high conversion and biodiesel yield. In the present study, synthesis of b...

2001
M. V. Landau A. Gutman M. Herskowitz R. Shuker Y. Bitton D. Mogilyansky

This study was aimed at defining the role of active phases in supported LiCl and LiCl–DyCl3 catalysts in the catalytic oxidative dehydrogenation (ODH) of n-butane. LiCl supported on silica displayed the highest activity and selectivity in n-butane ODH compared with other alkali metal halides. Addition of DyCl3 increased the activity. TPO, XRD and Raman light scattering (RLS) data showed that Li...

Journal: :Applied Catalysis B-environmental 2021

Thermochemical processing of lignin ends up with a major problem which is the high yield char remained from conversion, causing low yields desired products. The ReS2/Al2O3 catalyst, used in this work, exhibited char-suppressing potential and hydrodeoxygenation efficiency reductive liquefaction kraft lignin. Compared to NiMo/Al2O3, as conventional sulfide showed significantly better catalytic pe...

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